/* 第一层 */
.bgb1{
	width: 1920px;
	height: 500px;
}
/* 1 */
.img1{
	background-image: url(../img/1.jpg);
	width:300px;
	height:300px;
	margin-left: 100px;
	margin-top: 50px;
	float: left;
	border: 3px dashed skyblue;
	background-size: cover;
}
/* 2 */
.img2{ 
	background-image:url(../img/2.jpg);
	width:300px;
	height:300px;
	background-size: cover;
	float: left;
	margin-left: 100px;
	margin-top: 50px;
	border: 2px dotted gray;
}
/* 3 */
.img3{
	background-image:url(../img/3.jpg);
	width:300px;
	height:300px;
	background-size: cover;
	float: left;
	margin-left: 100px;
	margin-top: 50px;
	border: 4px double greenyellow;
}
/* 4 */
.img4{
	background-image:url(../img/4.jpg);
	width:300px;
	height:300px;
	background-size: cover;
	margin-left: 100px;
	margin-top: 50px;
	float: left;

	border: 4px solid greenyellow;
}
/* 5 */
.img5{ 
	background-image:url(../img/5.jpg);
	width:300px;
	height:300px;
	background-size: cover;
	float: left;
	margin-left: 100px;
	margin-top: 50px;
	border: 2px dotted gray;
}
/* 6*/
.img6{
	background-image:url(../img/6.jpg);
	width:300px;
	height:300px;
	background-size: cover;
	float: left;
	margin-left: 100px;
	margin-top: 50px;
	border: 4px double greenyellow;
}